Kernel atoms of Au nanoclusters are packed layer-by-layer along the [001] direction with every full (001) monolayer composed of 8 Au atoms (Au8 unit) in nanoclusters with formula of Au8n+4 (TBBT)4n+8 (n is the number of Au8 units; TBBTH=4-tert-butylbenzenelthiol). It is unclear whether the kernel atoms can be stacked in a defective-layer way along the [001] direction during growth of the series of nanoclusters and how the kernel layer number affects properties. Now, a nanocluster is synthesized that is precisely characterized by mass spectrometry and single-crystal X-ray crystallography, revealing a layer stacking mode in which a half monolayer composed of 4 atoms (Au4 unit) is stacked on the full monolayer along the [001] direction. The size and the odevity of the kernel layer number influence the properties (polarity, photoluminescence) of gold nanoclusters. The obtained nanocluster extends the previous formula from Au8n+4 (TBBT)4n+8 to Au4n+4 (TBBT)2n+8 (n is the number of Au4 units).

中文翻译：

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金纳米团簇中前所未有的内核生长模式和层数与浊度相关的特性。

Au纳米团簇的核原子沿[001]方向逐层堆积，每个完整的（001）单层由8个Au原子（Au8单元）组成的纳米团簇，分子式为Au8n + 4（TBBT）4n + 8（n是Au8单位的数目； TBBTH = 4-叔丁基苯硫醇）。尚不清楚在一系列纳米团簇的生长过程中是否可以沿[001]方向以缺陷层的方式堆叠内核原子，以及内核层数如何影响性能。现在，合成了一种通过质谱法和单晶X射线晶体学精确表征的纳米簇，揭示了一种层堆叠模式，其中由4个原子（Au4单元）组成的半单分子层沿[001]堆叠在整个单分子层上] 方向。内核层编号的大小和不稳定性会影响属性（极性，金纳米团簇的光致发光）。所获得的纳米簇将先前的公式从Au8n + 4（TBBT）4n + 8扩展到Au4n + 4（TBBT）2n + 8（n是Au4单元数）。